Exhaust-closing valve for hollow steel percussive drills.



L. C. BAYLES. EXHAUST CLOSING VALVE FOR HOLLOW STEEL PERCUSSIVE DRLLLS.

APPLICATION FILED SEPT-25. 1913.

1,144,991. Patented July 6, 1915.

WITNESSES. I/VVE/VTOR C3241 mgww y :7 m c. M 4 1444116! Lg I BY A TTOR/VEY UNITED ST LEWIS CONDICT BAYLES, 0F EESTON, PENNSYLVANIA, ASSIGNOR TO INGERSOLL-RAN D- z;

COMPANY, OF JERSEY CITY, NEW JERSEY, A GOBPQRATION OF NEW JERSEY.

EXHAUST-CLOSING VALVE FOR HOLLOW STEEL PERCUSSIVE DRILLS.

Specification of Letters Patent.

Patented July 6, .1915.

Application filed September 25, 1913. Serial No. 791,713.

To all whom it may concern Be it known that I. LEWIS C. BAYLES, a citizen of the United States, residing at. Easton, in the county of Northampton and State of Pennsylvania. have invented a certain new and useful Improvement in Exhaust-Closing Valves for Hollow Steel Percussive Drills, of which the following is a specification.

This invention relates to rock drills wherein air is conveyed to the hole from the cylinder through the steel. and relates more particular-l to a cylinder exhaust closing valve for such a drill.

In drills of the type shown, for instance, in the patent to Leyner #60l,538, May 21th,

1898, it has been proposed to add a valve,

which can be closed when desired to shutoff the exhaust from the cylinder so that all the air will pass through the drill steel and effectively clear out the hole.

The object of the presentinvention is to provide a simple and efficient valve for this purpose'which will be of small dimensions and which will remain in any desired position, when open or closed, without being affected by the continuous vibration of the drill.

the valve plug before the valve plug and sleeve have been secured in position, Fig. 6, a detail view showing the outer end of the valvesleeve and Fig. 7, a side elevation of the valve sleeve.

As shown, the valve is threaded into the exhaust pipe 1 of a drill 2, of the type shown in the Leyner patent, mentioned above, and comprises a plug 3 having a threaded portion & adapted to be threaded into the exhaust pipe of the drill and an outer cylindrical portion 5 in theside, of which is a.

circular opening 6 communicating with the hollow interior of the plug. The cylindrical portion 5 terminates in a head 7 of smaller diameter. Rotatably mounted on the cylindrical portion 5 is a valve closing sleeve 8 provided with a lateral opening 9 adapted to register with the circular opening fi of the valve plug 3. The outer end 10 of the closing sleeve 8 is of larger diameter and its surface is milled or roughened so that it can s r TENT orricn.

be easily grasped by the fingers. The ,difference between the diameters of the inner side of this outer portion 10 and the outer surface of the head 7 of the valve plug 3, re sults in an annular groove or slot 11 in which is placed a straightpiece of spring steel 1'2 of such a length that it must be bentor flexed to be inserted in the groove 11 with the result that its inner face frictionally engages the outer surface of the head 7 while the outer surface of its ends engage the in ner surface of the outer portion 10 of the closing sleeve 8. To hold the sleeve 8 and the spring 12 against longitudinal movement on the valve plug. a retaining ring 13 is secured to the head 7 of the valve plug 3 in any suitable manner such as by the ham mering down of the head 7, as shown in the drawings.

The operation of the device will be evidentfrom the above description. Then'alve sleeve can be easily turned into any position and by reason of the frictional contact of the spring 12 with the valve sleeve and the valve in the spirit and scope of the invention asv expressed in the claims.

\Vhat I claim is:

1. In an exhaust closing valve for rock drills, a valveplug having a bore and a lateral aperture therefrom. a closing sleeve rotatably mounted on said plug and having an aperture adapted to register with said plug aperture, a retaining ring secured to the end of said valve plug to hold said closing sleeve in position. andia flexed spring interposed between said plug and said sleeve to frietionally oppose relative rotation.

2. In an exhaust closing valve for rock drills, a valve plug having a cylindrical In testimony whoreof, hive hoi'eilnto 6n s aic1 cy1ind1"ic'a1 portion an cl having .an '5 iipei tu i'e-adapted to I eg:lSt1.W1t11 saidplug oilfier portionpi-ox'ided with a lateral fipersaid head 'to hold said 'slee'm and said spring tum and terminating in a head of smaller in position. diameter, '21 closing'sleeve' rotatably mounted LEWIS CONDICTFBAYLES. "aperture,'aflqxed spr ng 'inte rposedbetween Witnesses I said head of;smaller'diamefieriand said 0108- o. 1?. man; ingj'sle'eveand a. retaining ring secured to S. MILEY.' Y 

